Wrist-Worn Doppler Blood Pressure Monitor

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Solution Overview

Problem

Existing blood pressure monitoring devices are invasive, compressive, or require multiple data points, making them unsuitable for continuous, non-invasive, and non-compressive measurement of mean arterial pressure.

Innovation Solution

A non-invasive, non-compressive blood pressure monitoring device that uses doppler probes to measure velocity data from the wrist, processing this data to compute mean arterial pressure, systolic blood pressure, and diastolic blood pressure without occluding the blood vessels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional blood pressure cuff devices are used to measure SBP and DBP, then blood pressure values can be obtained, but the blood vessels are occluded and the device cannot be worn for extended periods

Engineering Contradiction:

Improveblood pressure measurementVSAvoidvessel occlusion

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical cuff-based measurement system with an optical measurement system using photodetectors and light sources to detect blood flow characteristics without mechanical compression. This substitution eliminates vessel occlusion while enabling continuous blood pressure monitoring through optical detection of blood flow velocity and volume changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces light as an intermediary medium to indirectly measure blood pressure parameters. Instead of directly compressing and measuring blood vessels mechanically, the system uses light absorption and transmission properties of blood to infer blood flow characteristics and calculate blood pressure values, thereby avoiding direct mechanical contact and vessel occlusion.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Duration of action of stationary object

If pulse transit time (PTT) method is used for cuffless blood pressure measurement, then continuous monitoring is possible, but multiple data points on the body are required which reduces convenience

Engineering Contradiction:

Improvecontinuous monitoring capabilityVSAvoidconvenience of measurement

Core Design Contradiction:

Duration of action of stationary objectVSEase of operation

Solution Approach 1:

The patent makes the wrist-worn device universally applicable by enabling it to perform multiple functions: optical blood flow detection, blood pressure calculation, and continuous monitoring all within a single location. The device uses the wrist artery as a universal measurement site, eliminating the need for multiple body location measurements while maintaining continuous monitoring capability through sustained optical detection at one site.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If skin distension measurement devices are used to measure blood vessel diameter changes, then blood pressure can be inferred, but accurate measurement is challenging due to small distension amounts and device placement requirements

Engineering Contradiction:

Improveblood pressure inferenceVSAvoidskin distension detection

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent creates an optical copy or representation of blood flow characteristics by measuring light absorption and transmission properties. Instead of directly measuring minute skin distension mechanically, the system captures optical signals that represent blood flow velocity and volume changes, providing an amplified and more easily measurable representation of hemodynamic parameters that can be accurately converted to blood pressure values.

Inventive Principle:

Principle #26Copying

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables continuous, accurate, and non-invasive measurement of blood pressure values, eliminating the need for invasive procedures, vessel occlusion, or multiple data points, thereby providing reliable perfusion pressure data for vital organs.

Implementation Method 1

at least one doppler probe is arranged within the case and aimed at an artery in the wrist when the case is strapped to the wrist

Methodology Applied

Scientific EffectDoppler effect: Doppler Effect

Implementation Method 2

The doppler velocity data is based, at least in part, on the absorption of the light by the artery and blood flow therethrough

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS12303240B2Non-invasive non-compressive blood pressure monitoring device

Publication Date: 2025.05.20 KL TECH LLC

AI summary

A blood pressure monitoring device includes a wrist strap, a case, and a display. The strap portion is adapted to fasten the device to the wrist without occluding blood flow. At least one doppler probe is arranged within the case for obtaining doppler signals from an artery in the wrist. A processor within the case is operable to compute mean arterial pressure, and optionally diastolic and systolic blood pressure based on the doppler signals. Related methods are also described.